[Bug rtl-optimization/71976] insn-combiner deletes a live 64-bit shift

[gjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71976

--- Comment #9 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Author: gjl
Date: Mon Aug  8 10:06:15 2016
New Revision: 239238

URL: https://gcc.gnu.org/viewcvs?rev=239238&root=gcc&view=rev
Log:
        Backport from 2016-07-29 trunk r238863.
        PR rtl-optimization/71976
        * combine.c (get_last_value): Return 0 if the argument for which
        the function is called has a wider mode than the recorded value.


Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/combine.c